Elevator control



July 111, 19333. J. J. FOGARTY 11,918,69241 ELEVATOR C ONTROL Filed Nov.6, 1931 A TOR/V5345.

Patented July 11, 1933 UNITED erases eArEN i isiaezi JOHN J. FOGARTY, orPHILADELPHIA, rnnnsrnvanre, ASSIGNOR To annulus 'rn'rnn- LOCKMANUFACTURING COIEPANY, F PHILADELPHIA, PENNSYLVANIA, A GORPO- V RATIONOF PENNSYLVANIA nnnva-ron oournon Application filed November Thisinvention relates to an elevator control, more particularly to meanswhereby the operation of an electrically driven. elevator will bedefinitely prevented in case any of the doors giving access to theshaft, as at landings, are open, and whereby 'a door cannot be openedunless the elevator is instopped position adjacent the correspondinglanding.

Specifically the invention relates to that type 'of control illustratedin the patent to Holberg, Patent No. 1,536,3 5 and inmy priorapplication, Ser. No.. de l J35, filed April 25. 1930.

It is the broad object of the present invention to provioe an improvedarrangement of the general type indicated above, which is of simpleconstruction and which will be noiseless in operation. More particularlythe present arrangement overcomes certam undesirable features of thearrangement illustrated in the Holberg patent. F or example, inhospitals it is desirable to have the operation as quiet as possible. Ifa solenoid such as that used to break the toggle in the Holbergarrangement, is energized by alternating current, it sometimes happensthat a continuous hum at the frequency of the alternating current willoccur, which-may be amplified and made quite noticeable by the metallicparts of the car. Furthermore, the toggle arrangement may possibly stickin which case, even though the solenoid is deenergized, it may notstraighten out in the proper fashion.

Attainment of the objects of improving the prior arrangements willbecome apparent from the following description read in conjunction withthe accompanying drawing in which the figure is a vertical sectionshowing the relationship of the parts of the apparatus carried by a carto portions of the apparatus locatedat the landing and controlled by andcontrolling the landing gate.

In the drawing there is illustrated a typical installation of anembodiment of the invention at a single landing, it being understoodthat similar installations are made at each landing. Further, while thearrangement is 6, 1931. Serial No. 573,2?2.

'r enr ch it is equally applicable'to any other type'ofgate or door.

The floor of a car is indicated at-2 carrying a plate on which issecured the inter-lock assembly. This inter-lock assembly includes thecar snoeG arranged to cooperate with a shoe, 7 pivoted on a verticalaxis to the wall of a shaft below a landing. This last mentioned shoe isarranged'to control and be moved by the usual rotating cam 9, which is abar 11 extending downwardly from the gate.

The car shoe 6, which corresponds to the one illustrated in the Holbergpatent, as con-. nected to the toggle, is carried by a plunger 8slideable within a fixed cylinder 10 carried by a suitable bracket 12. Aslot 14 in the wall of the cylinder 10 receives a pin 16 carried by theplunger 8 to prevent rotation of the.

plunger about its axis. A spring 18, reacting between the end of thecylinder 10 and the plunger 8, normally urges the car shoe 6 outwardlyto position to engage the shoe? located at the landings. e

An extension 20 of the plunger 8 carries a rack 22 meshing with a pinion24 secured to the shaft of the torque motor 26, the rack 22 being heldin mesh with the pinion 24 by a downwardly extending 'pin'27 carried bythe plate 4.

The torque motor is of a type now generally available for operation bycommercial alternating current. This motor has the characteristic ofbeing capable of holding a load c0 provided with a notch within whichengages of the spring 18 to such an extent that the car shoe 6 willclear the shoe 7 during the running of the elevator. The'motor 26 isenergized whenever the driving power is applied to the elevator.Accordingly, the car shoeli Wlll move outwardly agamst a shoe'Z'topermit opening of the corresponding gate only I when the power iscut off from the elevator.

In this Way there is accomplished the same r ea the device the car shoe6 is connected by. a

link to a piston 32 located Within a cylinder 32L which is vented to theatmosphere through an opening controlled by a screw 36 which 1 adjuststhe effective area of the opening so as to control the flow of airtherethrough and accordingly the speed of movement of the piston 32under the action of either the spring I "18 or the torque motor 26.

The rubber cushion 28 is provided topre- The operation of the device hasalready been indicated by the above described direct 1 operation of thecar shoeby the torque motor.

-Herein-is provided an arrangement Which is silent 111 operation andwhich by reason of its simplicity will not getoutoforder;

What I claim and desire to protect by Letters Patent is:

In an interlocking device for automatically controlled electricelevators in combination with a shaft provided With a landing and a gatetherefor, and an elevator car, a shoeat the-landing, connections wherebysaid shoe controls the gate, a shoe on the car adapted to engage thelanding vshoe, and means for controllinglthe position of the car shoe,said means including a torque motor, a pinion vdriven by the motor, arack meshing With the pinion and connected to the car shoe wherebythemotor'moves the car shoe in i one direction, a spring for moving thecar shoeiinthe opposite d1rcction,:an d a dash pot -for 1 controllingmovements" of 1 the car shoe, VB11t sound as the shoe moves to itslimiting- -outward POSItIOIL' said .dashpot comprising a fixedcylinderhaving'airestrictedoutlet, and a piston movable .ineithe cylinder andconnected to the cw shoe. 7 Y I -:In testimony of whichr-invention, Ihave hereunto set my-.hand,:at Philadelphia, Pa., on: this 4thday ofNovember, 1931.

HN J4 GALRTY 30

